In principle, the flow dividing switch can be roughly divided into a mechanical flow switch and an electronic flow switch.
The mechanical principle is a paddle type, turbine type, piston type, gravity type, etc.
The electronic principle includes thermal flow switch, electromagnetic flow switch, ultrasonic switch sensor, and the like.
Flow switch starts the work when the water flows, and it will be disconnected when there is no water or water shortage, which means to play a switch function and realize the alarm. Usually there are two leads, one lead is connected to the power supply, and the other lead is connected to the controller or the alarm.